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LEADTOOLS WPF and Silverlight (Leadtools.Windows.Media.Effects assembly)
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CircularShutterEffect Class






Members 
Leadtools.Windows.Media.Effects Namespace : CircularShutterEffect Class
Creates a circular or elliptical shutter effect by using a center point, radius, aspect ratio and a color to clear the area outside the shutter.
Object Model
Syntax
'Declaration
 
Public Class CircularShutterEffect 
   Inherits System.Windows.Media.Effects.ShaderEffect
   Implements System.Windows.Media.Animation.IAnimatable 
'Usage
 
Dim instance As CircularShutterEffect

            

        

            

            

            

        

            
        

            

        

            
            
            
            

            
            
Example

    

            
            

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Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.Windows.Controls
Imports Leadtools.Windows.Media
Imports Leadtools.Windows.Media.Effects

Class CircularShutterEffectExampleWindow
   Inherits Window
   Private theViewer As ImageViewer
   Public Sub New()
      Dim sp As New StackPanel()
      Content = sp

      theViewer = New ImageViewer()

      theViewer.HorizontalAlignment = HorizontalAlignment.Center
      theViewer.VerticalAlignment = VerticalAlignment.Top
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top

      sp.Children.Add(theViewer)

      ' Load an image into the viewer
      theViewer.Source = New BitmapImage(New Uri(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg")))

      Title = "CircularShutterEffect - Click and and move the mouse cursor on the image to see the effect"

      AddHandler theViewer.PreviewMouseDown, AddressOf theViewer_PreviewMouseDown
      AddHandler theViewer.MouseMove, AddressOf theViewer_MouseMove
      AddHandler theViewer.MouseUp, AddressOf theViewer_MouseUp
   End Sub

   Private Sub theViewer_PreviewMouseDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
      Dim effect As New CircularShutterEffect()

      Dim pos As Point = e.GetPosition(theViewer)

      Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource)
      If Not source Is Nothing Then
         effect.Center = New Point( _
            (1.0 * pos.X) / source.PixelWidth, _
            (1.0 * pos.Y) / source.PixelHeight)

         effect.Radius = 0.25
         effect.AspectRatio = 1.0
         effect.ClearColor = Colors.Blue
         theViewer.ImageEffect = effect
      End If
   End Sub

   Private Sub theViewer_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
      Dim effect As CircularShutterEffect = DirectCast(theViewer.ImageEffect, CircularShutterEffect)
      If Not effect Is Nothing Then
         Dim pos As Point = e.GetPosition(theViewer)

         Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource)
         If Not source Is Nothing Then
            effect.Center = New Point( _
               (1.0 * pos.X) / source.PixelWidth, _
               (1.0 * pos.Y) / source.PixelHeight)
         End If
      End If
   End Sub

   Private Sub theViewer_MouseUp(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
      If Not theViewer.ImageEffect Is Nothing Then
         theViewer.ImageEffect = Nothing
      End If
   End Sub
End Class

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

            

   

     

            
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.Windows.Controls;
using Leadtools.Windows.Media;
using Leadtools.Windows.Media.Effects;

class CircularShutterEffectExampleWindow : Window
{
   private ImageViewer theViewer;
   public CircularShutterEffectExampleWindow()
   {
      StackPanel sp = new StackPanel();
      Content = sp;

      theViewer = new ImageViewer();

      theViewer.HorizontalAlignment = HorizontalAlignment.Center;
      theViewer.VerticalAlignment = VerticalAlignment.Top;
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left;
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top;

      sp.Children.Add(theViewer);

      // Load an image into the viewer
      theViewer.Source = new BitmapImage(new Uri(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg")));

      Title = "CircularShutterEffect - Click and and move the mouse cursor on the image to see the effect";

      theViewer.PreviewMouseDown += new MouseButtonEventHandler(theViewer_PreviewMouseDown);
      theViewer.MouseMove += new MouseEventHandler(theViewer_MouseMove);
      theViewer.MouseUp += new MouseButtonEventHandler(theViewer_MouseUp);
   }

   private void theViewer_PreviewMouseDown(object sender, MouseButtonEventArgs e)
   {
      CircularShutterEffect effect = new CircularShutterEffect();

      Point pos = e.GetPosition(theViewer);

      BitmapSource source = theViewer.Source as BitmapSource;
      if(source != null)
      {
         effect.Center = new Point(
            (1.0 * pos.X) / source.PixelWidth,
            (1.0 * pos.Y) / source.PixelHeight);

         effect.Radius = 0.25;
         effect.AspectRatio = 1.0;
         effect.ClearColor = Colors.Blue;
         theViewer.ImageEffect = effect;
      }
   }

   private void theViewer_MouseMove(object sender, MouseEventArgs e)
   {
      CircularShutterEffect effect = theViewer.ImageEffect as CircularShutterEffect;
      if(effect != null)
      {
         Point pos = e.GetPosition(theViewer);

         BitmapSource source = theViewer.Source as BitmapSource;
         if(source != null)
         {
            effect.Center = new Point(
               (1.0 * pos.X) / source.PixelWidth,
               (1.0 * pos.Y) / source.PixelHeight);
         }
      }
   }

   private void theViewer_MouseUp(object sender, MouseButtonEventArgs e)
   {
      if(theViewer.ImageEffect != null)
      {
         theViewer.ImageEffect = null;
      }
   }
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

            

   

     

            
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.Windows.Media;
using Leadtools.Windows.Media.Effects;
using Leadtools.Windows.Controls;

class CircularShutterEffectExampleWindow : UserControl
{
   private ImageViewer theViewer;
   public CircularShutterEffectExampleWindow()
   {
      StackPanel sp = new StackPanel();
      Content = sp;

      theViewer = new ImageViewer();

      theViewer.HorizontalAlignment = HorizontalAlignment.Center;
      theViewer.VerticalAlignment = VerticalAlignment.Top;
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left;
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top;

      sp.Children.Add(theViewer);

      // Load an image into the viewer
      theViewer.Source = new BitmapImage(new Uri(LeadtoolsExamples.Common.ImagesPath.Path + "Cannon.jpg"));

      theViewer.MouseMove += new MouseEventHandler(theViewer_MouseMove);
   }

   private void theViewer_PreviewMouseDown(object sender, MouseButtonEventArgs e)
   {
      CircularShutterEffect effect = new CircularShutterEffect();

      Point pos = e.GetPosition(theViewer);

      BitmapSource source = theViewer.Source as BitmapSource;
      if(source != null)
      {
         effect.Center = new Point(
            (1.0 * pos.X) / source.PixelWidth,
            (1.0 * pos.Y) / source.PixelHeight);

         effect.Radius = 0.25;
         effect.AspectRatio = 1.0;
         effect.ClearColor = Colors.Blue;
         theViewer.ImageEffect = effect;
      }
   }

   private void theViewer_MouseMove(object sender, MouseEventArgs e)
   {
      CircularShutterEffect effect = theViewer.ImageEffect as CircularShutterEffect;
      if(effect != null)
      {
         Point pos = e.GetPosition(theViewer);

         BitmapSource source = theViewer.Source as BitmapSource;
         if(source != null)
         {
            effect.Center = new Point(
               (1.0 * pos.X) / source.PixelWidth,
               (1.0 * pos.Y) / source.PixelHeight);
         }
      }
   }

   private void theViewer_MouseUp(object sender, MouseButtonEventArgs e)
   {
      if(theViewer.ImageEffect != null)
      {
         theViewer.ImageEffect = null;
      }
   }
}

            

   

     

            
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.Windows.Controls
Imports Leadtools.Windows.Media
Imports Leadtools.Windows.Media.Effects

Class CircularShutterEffectExampleWindow
   Inherits UserControl
   Private theViewer As ImageViewer
   Public Sub New()
      Dim sp As New StackPanel()
      Content = sp

      theViewer = New ImageViewer()

      theViewer.HorizontalAlignment = HorizontalAlignment.Center
      theViewer.VerticalAlignment = VerticalAlignment.Top
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top

      sp.Children.Add(theViewer)

      ' Load an image into the viewer
      theViewer.Source = New BitmapImage(New Uri(LeadtoolsExamples.Common.ImagesPath.Path + "Cannon.jpg"))

      AddHandler theViewer.MouseMove, AddressOf theViewer_MouseMove
   End Sub

   Private Sub theViewer_PreviewMouseDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
      Dim effect As New CircularShutterEffect()

      Dim pos As Point = e.GetPosition(theViewer)

      Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource)
      If Not source Is Nothing Then
         effect.Center = New Point( _
            (1.0 * pos.X) / source.PixelWidth, _
            (1.0 * pos.Y) / source.PixelHeight)

         effect.Radius = 0.25
         effect.AspectRatio = 1.0
         effect.ClearColor = Colors.Blue
         theViewer.ImageEffect = effect
      End If
   End Sub

   Private Sub theViewer_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
      Dim effect As CircularShutterEffect = DirectCast(theViewer.ImageEffect, CircularShutterEffect)
      If Not effect Is Nothing Then
         Dim pos As Point = e.GetPosition(theViewer)

         Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource)
         If Not source Is Nothing Then
            effect.Center = New Point( _
               (1.0 * pos.X) / source.PixelWidth, _
               (1.0 * pos.Y) / source.PixelHeight)
         End If
      End If
   End Sub

   Private Sub theViewer_MouseUp(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
      If Not theViewer.ImageEffect Is Nothing Then
         theViewer.ImageEffect = Nothing
      End If
   End Sub
End Class

            

   

     

            
<Window x:Class="CircularShutterEffectExample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:leadControls="clr-namespace:Leadtools.Windows.Controls;assembly=Leadtools.Windows.Controls"
xmlns:leadEffects="clr-namespace:Leadtools.Windows.Media.Effects;assembly=Leadtools.Windows.Media.Effects"
Height="600" Width="800">
   <StackPanel>
      <leadControls:ImageViewer
         HorizontalAlignment="Center" VerticalAlignment="Top"
         ImageHorizontalAlignment="Left" ImageVerticalAlignment="Top"
         Source="file:///c:\users\Public\Documents\LEADTOOLS Images\cannon.jpg">
         <leadControls:ImageViewer.ImageEffect>
            <leadEffects:CircularShutterEffect Center="0.5,0.5" Radius="0.25" AspectRatio="1.0" ClearColor="Blue">
            </leadEffects:CircularShutterEffect>
         </leadControls:ImageViewer.ImageEffect>
      </leadControls:ImageViewer>
   </StackPanel>
</Window>

            

   

      
	
      
	
    

            
           
            
Requirements
Target Platforms

            
            
See Also
Reference
CircularShutterEffect Members

Leadtools.Windows.Media.Effects Namespace

Introduction




        
    

	
    

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